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service.go
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service.go
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package hipchat
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"path"
"sync/atomic"
"github.com/influxdata/kapacitor/alert"
"github.com/influxdata/kapacitor/keyvalue"
)
type Diagnostic interface {
WithContext(ctx ...keyvalue.T) Diagnostic
Error(msg string, err error)
}
type Service struct {
configValue atomic.Value
diag Diagnostic
}
func NewService(c Config, d Diagnostic) *Service {
s := &Service{
diag: d,
}
s.configValue.Store(c)
return s
}
func (s *Service) Open() error {
return nil
}
func (s *Service) Close() error {
return nil
}
func (s *Service) config() Config {
return s.configValue.Load().(Config)
}
func (s *Service) Update(newConfig []interface{}) error {
if l := len(newConfig); l != 1 {
return fmt.Errorf("expected only one new config object, got %d", l)
}
if c, ok := newConfig[0].(Config); !ok {
return fmt.Errorf("expected config object to be of type %T, got %T", c, newConfig[0])
} else {
s.configValue.Store(c)
}
return nil
}
func (s *Service) Global() bool {
c := s.config()
return c.Global
}
func (s *Service) StateChangesOnly() bool {
c := s.config()
return c.StateChangesOnly
}
type testOptions struct {
Room string `json:"room"`
Message string `json:"message"`
Level alert.Level `json:"level"`
}
func (s *Service) TestOptions() interface{} {
c := s.config()
return &testOptions{
Room: c.Room,
Message: "test hipchat message",
Level: alert.Critical,
}
}
func (s *Service) Test(options interface{}) error {
o, ok := options.(*testOptions)
if !ok {
return fmt.Errorf("unexpected options type %T", options)
}
c := s.config()
return s.Alert(o.Room, c.Token, o.Message, o.Level)
}
func (s *Service) Alert(room, token, message string, level alert.Level) error {
url, post, err := s.preparePost(room, token, message, level)
if err != nil {
return err
}
resp, err := http.Post(url, "application/json", post)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusNoContent {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
type response struct {
Error string `json:"error"`
}
r := &response{Error: fmt.Sprintf("failed to understand HipChat response. code: %d content: %s", resp.StatusCode, string(body))}
b := bytes.NewReader(body)
dec := json.NewDecoder(b)
dec.Decode(r)
return errors.New(r.Error)
}
return nil
}
func (s *Service) preparePost(room, token, message string, level alert.Level) (string, io.Reader, error) {
c := s.config()
if !c.Enabled {
return "", nil, errors.New("service is not enabled")
}
//Generate HipChat API URL including room and authentication token
if room == "" {
room = c.Room
}
if token == "" {
token = c.Token
}
u, err := url.Parse(c.URL)
if err != nil {
return "", nil, err
}
u.Path = path.Join(u.Path, room, "notification")
v := url.Values{}
v.Set("auth_token", token)
u.RawQuery = v.Encode()
var color string
switch level {
case alert.Warning:
color = "yellow"
case alert.Critical:
color = "red"
default:
color = "green"
}
postData := make(map[string]interface{})
postData["from"] = "kapacitor"
postData["color"] = color
postData["message"] = message
postData["notify"] = true
var post bytes.Buffer
enc := json.NewEncoder(&post)
err = enc.Encode(postData)
if err != nil {
return "", nil, err
}
return u.String(), &post, nil
}
type HandlerConfig struct {
// HipChat room in which to post messages.
// If empty uses the channel from the configuration.
Room string `mapstructure:"room"`
// HipChat authentication token.
// If empty uses the token from the configuration.
Token string `mapstructure:"token"`
}
type handler struct {
s *Service
c HandlerConfig
diag Diagnostic
}
func (s *Service) Handler(c HandlerConfig, ctx ...keyvalue.T) alert.Handler {
return &handler{
s: s,
c: c,
diag: s.diag.WithContext(ctx...),
}
}
func (h *handler) Handle(event alert.Event) {
if err := h.s.Alert(
h.c.Room,
h.c.Token,
event.State.Message,
event.State.Level,
); err != nil {
h.diag.Error("failed to send event to Alerta", err)
}
}